Caustic Song file (optional):
a way to get pwm in subsynth that i've been using for years but never actually seen here.
osc 1: saw
osc 2: custom, start with a saw in the waveform draw-er thing and carefully invert it so it goes up instead of down, preserving its phase and amplitude
the two slopes should perfectly cancel each other out and, because the default saw and the custom saw are 90° out of phase, this should produce a perfect square wave because of reasons. you can now modulate the phase knob and thus the pulse width. this is like, the only polyphonic pwm in caustic unless you do something weird in pcmsynth lol